CVE-2021-21556 Memory corruption in PowerEdge BIOS Intel 15G
A local high-privilege attacker can exploit a stack-based buffer overflow in Dell PowerEdge BIOS with NVDIMM-N to execute code, cause DoS, or disclose information.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-21556?
CVE-2021-21556 is a medium-severity memory corruption vulnerability in Dell PowerEdge BIOS Intel 15G, published on 14 Jun 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Dell PowerEdge R640, R740, R740XD, R840, R940, R940xa, MX740c, MX840c, and T640 Server BIOS contain a stack-based buffer overflow vulnerability in systems with NVDIMM-N installed. A local malicious user with high privileges may potentially exploit this vulnerability, leading to a denial of Service, arbitrary code execution, or information disclosure in UEFI or BIOS Preboot Environment.
Which versions are affected by CVE-2021-21556?
It affects 9 products.
Products include Dell Poweredge Mx740c Firmware, Dell Poweredge Mx840c Firmware, Dell Poweredge R640 Firmware, Dell Poweredge R740 Firmware, Dell Poweredge R740xd Firmware, Dell Poweredge R840 Firmware and 3 more.
How do I fix CVE-2021-21556?
No fix has been published for CVE-2021-21556 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-21556 being exploited?
There is no known exploitation of CVE-2021-21556 in the wild and no public exploit code.
Other vulnerabilities in Dell PowerEdge BIOS Intel 15G
Sources
Also known as GHSA-9fc4-hxq5-hwj6.